A comparison of fishery biology of jumbo flying squid, Dosidicus gigas outside three Exclusive Economic Zones in the Eastern Pacific Ocean

Biological and Fishery Parameters of Jumbo Squid (Dosidicus gigas) in the Colombian Pacific, a Resource without Directed Fishing Exploitation

“…Although the size at recruitment of male D. gigas could not be established for the central northern Colombian Pacific, the estimated size at recruitment of females (L 50 = 23.3 cm ML) was lower than the size reported for tropical areas in the EPO (Ecuador L 50 = 32.4 cm ML [64], Costa Rica L 50 = 29.7 cm LM [30]), as well as in areas in the northern and southern limits of its distribution (Peru L 50 = 54.2 cm ML [49], Mexico > 38 cm ML [65]). Jumbo squids exhibit year-round reproductive activity in the central northern Colombian Pacific; however, the greatest proportion of mature females was recorded between January and March.…”

“…Although the spatial coverage of our study limits extrapolation of observed sizes to the real stock size composition, the observed mean mantle size of 24.2 cm suggests that the D. gigas population present in the central northern Colombian Pacific belongs to the population of small-sized individuals (Table 1) that has been identified as dominant in the warm tropical waters of the EPO [10]. Jumbo squid exhibit a wide spatial variability in size throughout their geographic range of occupancy; in the southern (Chile-Peru) and northern zone (Mexico-USA) larger-sized specimens, mean MLs between 50.0 cm and 70.0 cm are reported, while in the central zone (Costa Rica) small-sized specimens with MLs between 25.0 and 30.0 cm are present [49][50][51][52][53]. According to molecular studies carried out on individuals captured in Mexico and Peru, size variations exhibited by jumbo squids along their distribution range could be the result of high phenotypic plasticity in this species [54]; size differences are not related to intrapopulation genetic differentiation [55,56], but to local variations in environmental conditions and food availability [26,57,58].…”

Age, Growth and Population Structure Analyses of the Purpleback Flying Squid Sthenoteuthis oualaniensis in the Northwest Indian Ocean by Beak Microstructure

“…The age and growth of squid are both affected by many factors, and optimal growth equations may differ among different squid sexes, populations and habitats [27,51]. No single model can accurately describe the growth relationship of a squid throughout its whole life cycle [52]. Therefore, multiple models should be used to fit the growth characteristics of S. oualaniensis; the fitting effects of the models should be compared, and the most suitable growth model should be selected.…”